System Attitude Adjustment Based on Zhang Zhengyou Calibration Method
The digital speckle pattern interferometry measurement system has been widely used in deformation measurement.In an ideal situation,the optical axis of the system is perpendicular to the surface of the object,but in practical applications,the placement posture of the system and the inclination of the object will cause projective distortion leading to measurement errors.For this issue,a verticality measuring instrument can be used for calibration,but this will increase the measurement cost,and the parallelism between the instrument's optical axis and the measurement system's optical axis may introduce errors again.Therefore,the article analyzes the impact of projective distortion based on imaging theory,and proposes a calibration method based on Zhang Zhengyou to obtain the rotation matrix and calculate the rotation angle as a judgment method for the verticality of the system's optical axis and the object during online measurement,providing reference for the attitude adjustment of the system.The experimental results show that the error of this method can be controlled within±1°.
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